YThe oldest known text found was 2600 years old, and referred to an Egyptian. Maybe she got lost before she got to Abe's tent!
Hagar may have been whoziewhazzit but Abraham was the FIRST JEW. Back then, if you'll look at the Genealogies in Numbers and elsewhere, Lineage was from the FATHER, not the Mama. So Ishmael was considered his FATHER's Child.
If Islamics want to claim Ishmael as their forebear, then they must have a deep-seated self-hate because THEY ARE JEWISH. AFter all, Abraham circumcised Ishmael long before Isaac was even born. And circumcision was a 'sign of the covenant' between the Hebrew/Jewish people and the True God (of Abraham, Isaac and Jacob).
So, boys and girls, what does that make Islam?
Hmmmmmmmmmmmm? (think "the church lady" on Saturday Nite Live)